Latch.



e. H. mance.

LATGH.

(Application filed Sept. 11, 1901.)

(N0 Model.)

THE Nonms PETERS c. wnvnuwq, wnsnmuron, nA c.

Patnted :une lo, |902'.

` Y AUNITED ST-rvrnsI OFFICE.

GEoRGE H. PIERCE, or lNEEDIIAM,MAssAC'nUsETTs.4

SPECIFICATION forming partof Letejrsrant No. roam-mated June 1o, 1902.

Application filed September 1l, 1901. y SerialNo-751099. `(Noniodel.)

To a/ZZ www'z, t 'outgrow/cern: Y

Be it known that I," GEoRGE H. PIERCE, a' citizen of the United Sta-tes, residing at Needvham, in the countyof'jNorfolk and State of 5 Massachusetts, have invented certainnew.

and usefullImprovements in Door-Latches; and I do hereby declare. the following to bea full, clear, and enact ldescription of the in.

vention, such as will enable others skilled in I Io. the art to which it appertains to makeand use the same."V v

This invention relate'sto door-latches; and

it'consists in the novel Construction and com- Vbination fof theparts hereinafter fully described and claimed.

In the'drawings, Figure 1 is a front view of the latch. Fig;V 2.` i's a rear View of thelatch' vwith the 'back 'plate removed. Fig' is a Cross-section takenjonthe vline :na: in Fig. l.

zo Fig. 4 is a longitudinal section taken on the v between the said plates@ and in the front part of the frame. y E is a spring which normally presses :the bolt C forward.

i, The bolt C has aptoothor ribrc on itsside next to the frontplate, and 4F is a tumbler whichis pivoted onl a pin'f, projecting from the plate a under the'y vchamber]D.";'Ihe; tumbler- F fis pressed upward' into',v enga,.ig,ey

4o ment with thetoothc" by means of a spring G, and gis a stop. on the plate a,- which limits .Y

the upward movement of the tumbler.

o H is a vertical pin for holding the tumbler F out of engagementwiththe tooth c. This "pin is slidable and revoluble in the frame A, and h is acatch onthe frame A. The pin-H has a projection h', which is slipped into engagement with the vcatch h when the pin is depressed; .but any other approved means 5o may be used for holding the tumbler out of action. y. When the tumbler is heldoutof ac.`

tion, the bolt'-nay be'ope'rated asanordinary spring latch-bolt. y

The plates d and dareA provided with keyyholes gland j', arranged in line with each other and formed to fit the key J. The key .I has a slotk, lwhich engages with the plated, so

rthatjthe partit".n ofthe key operates the bolt Cand'thenpart'm works in the chamber D and operates the tumbler. The key may be andv d in any approved manner, Y n

N is a raised escutcheon on the .plate ct. This escutcheonis provided with a keyhole n,

.which is different-'Xin form from thekeyholes plate B on the' axis ofy the. three -keyholes AThe key is rstinsertdthrough the keyhole n'andis then partially. revolved on the pin and ispushed through'the' fkeyholesfj` and j".

The outer keyhole n aords no Clue tothe form or sizeof the innerkeyholes and j',

and the? escutcheon conceals'the inner keyholes and preventsV the i insertion of instruments for picking the latch or for ascertainv ing lthe actual/position, size, and form of the w .latchlfwuonly be Oberste@ bythe key perinner keyholesl and their adjuncts. The

6o provided-with,any, desired grooves for' enkgaging with wards -or "guides on the plates a 7 and jand which' is arranged out of line ,With thorn.

taining; to it when jthe tumbler is l"in `operatiolnfand j when suoh',`k`eyisinserted the part `e'shoots .back the bolt at the 4"same ktime as the 'part m'depresses 'the ltumblerl and vpermits the-said bolt 'to be retracted. v

What I claimjisl 'v l y l f In a latch, the combination, lwith a frame ing an inner keyhole, of an escutcheon on the said front plate having a stationary plate `provided with a stationary front plate havl r @provided with an outer vkeyhole which is arranged 'out of linewiththefaforesaid inner 'l keyhole, and' a Droieeins guidQrnffE-the key arranged on the'axi's of the` twosaid'keyholes, substantially as'setforth.

in presence' of two'witnesses.

. GEORGE H. PIERCE. Witnesses: A

YALICE J. MURRAIQ FREDERICK K. DAGGETT.

In testimony whereof'I afti'irwinymsignature 

